{"id":"ca820217-089b-4aee-bcb7-b5b0e7d473ae","shortId":"5Hs2fE","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/customers/67` is labeled \"Premium API Access\" and accepts POST requests settled via the x402 exact-payment scheme.\n\nThe platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02 price point.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The x402 challenge for this specific endpoint confirms it is live, requesting a maximum of 20,000 base units of USDC (6 decimals = $0.02) on Base network, consistent with the advertised pricing.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","crypto-paid API","402 payment API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific endpoint /api/v1/customers/67 has no description of expected input or output beyond 'Premium API Access'","Cannot verify what data or functionality any of the advertised endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/67","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/customers/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The purpose of the specific /api/v1/customers/67 endpoint is unclear beyond its label. Effectively a stub 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'/request':13,28 '0.02':12,27,59,149,214 '000':207 '20':206 '402 payment API' '6':212 'Base network API' 'USDC micropayment API' 'accept':91 'access':89 'advertis':104,221 'ai':116 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':120 'analyt':48,110 'api':5,20,37,71,88,108,158 'avail':186 'base':8,23,67,208,216 'broad':42 'call':4,19 'categori':106 'challeng':193 'classif':123 'commit':78 'confirm':198 'connect':167 'consist':218 'content':173 'convers':140 'conversion' 'cost':58 'crawl':189 'crypto-gas-estimates' 'crypto-paid API' 'data':47,52,109,113 'data-analytics' 'decim':213 'detail':184 'doc':157 'document':152,185 'embed':124 'enabl':36 'endpoint':45,57,82,143,197 'estim':134 'everi':56 'exact':99 'exact-pay':98 'exampl':181 'exchang':129 'exchange-rates' 'export':114 'extrem':154 'feed':128 'financ':125 'finance-price-feeds' 'finance/web3':51 'four':105 'gas':133 'generat':141 'geocod':138 'geocoding' 'infer':50 'infrastructur':136 'insight':115 'key':72 'label':86 'learn':118 'limit':75 'list':145 'live':201 'low payment fee API' 'lowpaymentfee.com':31 'machin':117 'maximum':204 'metric':111 'network':9,24,68,217 'offer':40 'openapi':177 'page':162,190 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':100 'per':3,18,60 'platform':6,21,38,103 'point':151 'post':92 'premium':87 'price':127,150,159,222 'prompt':169 'quot':132 'rate':74,130 'readm':161 'render':164 'report':112 'request':61,93,202 'request/response':180 'requir':79 'schema':178 'scheme':101 'sentiment':119 'servic':55 'set':43 'settl':94 'span':46 'spars':155 'specif':81,196 'summar':122 'text':121 'token':131 'unit':209 'usdc':15,30,64,211 'usdc-base-network' 'util':54,137 'valid':139 'validation' 'via':10,25,95 'wallet':168 'web3':126 'x402':11,26,35,97,192 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bd62f767-c808-4821-a1cb-6a686ca940b5","listingId":"ca820217-089b-4aee-bcb7-b5b0e7d473ae","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/customers/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:28.771Z"}],"sources":[{"listingId":"ca820217-089b-4aee-bcb7-b5b0e7d473ae","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:28.771Z","lastSeenAt":"2026-04-22T21:30:32.467Z"}],"details":{"listingId":"ca820217-089b-4aee-bcb7-b5b0e7d473ae","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/67 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/customers/67 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/67"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto price feeds with per-call USDC payments","Running utility operations like geocoding or data validation via micropayments","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","Use cases requiring micropayment-settled AI inference on Base","Quick prototyping without API key provisioning or subscription commitments"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users who need non-crypto payment methods","High-volume use cases where per-request pricing may be inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.833Z"},"updatedAt":"2026-04-22T21:30:32.467Z"}}